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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function Person(name,age) {
            this.name=name,
            this.age=age
        }
        Person.prototype.run=function(){
            console.log('跑');
        }
        function student(name,age,sex) {
            //this指向子类的实例化对象
            Person.call(this,name,age,sex)
            this.sex=sex
        }
        student.prototype=new Person
        student.prototype.constructor
        const ming=new student('明',18,'男')
        ming.run()
        console.log(ming);
    </script>
</body>
</html>